manjaro-tools/lib/util-fstab.sh

#!/bin/bash
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

declare -A pseudofs_types=([anon_inodefs]=1
						[autofs]=1
						[bdev]=1
						[binfmt_misc]=1
						[cgroup]=1
						[configfs]=1
						[cpuset]=1
						[debugfs]=1
						[devfs]=1
						[devpts]=1
						[devtmpfs]=1
						[dlmfs]=1
						[fuse.gvfs-fuse-daemon]=1
						[fusectl]=1
						[hugetlbfs]=1
						[mqueue]=1
						[nfsd]=1
						[none]=1
						[pipefs]=1
						[proc]=1
						[pstore]=1
						[ramfs]=1
						[rootfs]=1
						[rpc_pipefs]=1
						[securityfs]=1
						[sockfs]=1
						[spufs]=1
						[sysfs]=1
						[tmpfs]=1)

declare -A fsck_types=([cramfs]=1
					[exfat]=1
					[ext2]=1
					[ext3]=1
					[ext4]=1
					[ext4dev]=1
					[jfs]=1
					[minix]=1
					[msdos]=1
					[reiserfs]=1
					[vfat]=1
					[xfs]=1)

fstype_is_pseudofs() {
	(( pseudofs_types["$1"] ))
}

fstype_has_fsck() {
	(( fsck_types["$1"] ))
}

valid_number_of_base() {
	local base=$1 len=${#2} i=

	for (( i = 0; i < len; i++ )); do
		{ _=$(( $base#${2:i:1} )) || return 1; } 2>/dev/null
	done

	return 0
}

mangle() {
	local i= chr= out=

	unset {a..f} {A..F}

	for (( i = 0; i < ${#1}; i++ )); do
		chr=${1:i:1}
		case $chr in
			[[:space:]\\])
				printf -v chr '%03o' "'$chr"
				out+=\\
			;;
		esac
		out+=$chr
	done

	printf '%s' "$out"
}

unmangle() {
	local i= chr= out= len=$(( ${#1} - 4 ))

	unset {a..f} {A..F}

	for (( i = 0; i < len; i++ )); do
		chr=${1:i:1}
		case $chr in
			\\)
				if valid_number_of_base 8 "${1:i+1:3}" ||
					valid_number_of_base 16 "${1:i+1:3}"; then
					printf -v chr '%b' "${1:i:4}"
					(( i += 3 ))
				fi
			;;
		esac
		out+=$chr
	done

	printf '%s' "$out${1:i}"
}

dm_name_for_devnode() {
	read dm_name <"/sys/class/block/${1#/dev/}/dm/name"
	if [[ $dm_name ]]; then
		printf '/dev/mapper/%s' "$dm_name"
	else
		# don't leave the caller hanging, just print the original name
		# along with the failure.
		print '%s' "$1"
		error 'Failed to resolve device mapper name for: %s' "$1"
	fi
}

optstring_match_option() {
	local candidate pat patterns

	IFS=, read -ra patterns <<<"$1"
	for pat in "${patterns[@]}"; do
		if [[ $pat = *=* ]]; then
			# "key=val" will only ever match "key=val"
			candidate=$2
		else
			# "key" will match "key", but also "key=anyval"
			candidate=${2%%=*}
		fi

		[[ $pat = "$candidate" ]] && return 0
	done

	return 1
}

optstring_remove_option() {
	local o options_ remove=$2 IFS=,

	read -ra options_ <<<"${!1}"

	for o in "${!options_[@]}"; do
		optstring_match_option "$remove" "${options_[o]}" && unset 'options_[o]'
	done

	declare -g "$1=${options_[*]}"
}

optstring_normalize() {
	local o options_ norm IFS=,

	read -ra options_ <<<"${!1}"

	# remove empty fields
	for o in "${options_[@]}"; do
		[[ $o ]] && norm+=("$o")
	done

	# avoid empty strings, reset to "defaults"
	declare -g "$1=${norm[*]:-defaults}"
}

optstring_append_option() {
	if ! optstring_has_option "$1" "$2"; then
		declare -g "$1=${!1},$2"
	fi

	optstring_normalize "$1"
}

optstring_prepend_option() {
	local options_=$1

	if ! optstring_has_option "$1" "$2"; then
		declare -g "$1=$2,${!1}"
	fi

	optstring_normalize "$1"
}

optstring_get_option() {
	local opts o

	IFS=, read -ra opts <<<"${!1}"
	for o in "${opts[@]}"; do
		if optstring_match_option "$2" "$o"; then
			declare -g "$o"
			return 0
		fi
	done

	return 1
}

optstring_has_option() {
	local "${2%%=*}"

	optstring_get_option "$1" "$2"
}